three charles f . adams @ - @ class destroyers were purchased from the united states to replace the age ##ing q @ - @ class destroyers . traditionally , the ran had purchased designs based on those of the royal navy and the purchase of american destroyers was significant . hm ##as perth and hm ##as hobart joined the fleet in 1965 , followed by hm ##as brisbane in 1967 . other projects included the construction of six river @ - @ class frigates , the conversion of the aircraft carrier hm ##as melbourne to an anti @ - @ submarine role , the acquisition of ten wessex helicopters , and the purchase of six obe ##ron @ - @ class submarines . the raaf took delivery
three charles f. adams @ - @ class destroyers were purchased from the united states to replace the ageing q @ - @ class destroyers. traditionally, the ran had purchased designs based on those of the royal navy and the purchase of american destroyers was significant. hmas perth and hmas hobart joined the fleet in 1965, followed by hmas brisbane in 1967. other projects included the construction of six river @ - @ class frigates, the conversion of the aircraft carrier hmas melbourne to an anti @ - @ submarine role, the acquisition of ten wessex helicopters, and the purchase of six oberon @ - @ class submarines. the raaf took delivery